ubiquitous network


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ubiquitous network

  1. 1. Implementation of a Cable Access Point Device for Ubiquitous Network Applications
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  3. 3. ABSTRACT <ul><li>This paper presents the implementation of a low-cost, data access-efficient, sample and easy to deployment, waterproof, and heatproof outdoor Cable Access Point (CAP) device for ubiquitous network applications. </li></ul>
  4. 4. ABSTRACT (cont.) <ul><li>The main purpose of the CAP device is to effectively extend the coverage of outdoor wireless access link and to further provide a data access-efficient service for construction of a ubiquitous networking environment in the metropolitan area. </li></ul>
  5. 5. ABSTRACT (cont.) <ul><li>Besides, to ensure the safety and validity for data accessing and information exchanging in the wireless broadband network, a security certifying mechanism of authentication, authorization, and accounting (AAA) is also integrated in the CAP device. </li></ul>
  6. 6. Architecture of CAP device. Figure 1:The system architecture of the proposed CAP device.
  7. 7. WHY CABLE ACCESS POINT <ul><li>The requirement for the network accessing service has expanded from the indoor area to the outdoor environment, so as to support better coverage of network accessing areas and to provide more efficient and convenient data access link services for people to support ubiquitous network applications. </li></ul>
  8. 8. WHY CAP (cont.) <ul><li>It is Hard to maintain the overall signal quality in a large transmission range in outdoor environment. </li></ul><ul><li>On the other hand, the security certifying mechanism of authentication, authorization, and accounting (AAA) in wireless networks is also an important issue </li></ul>
  9. 9. APPLICATION SCENARIO OF CAP DEVICES Fig. 2. The CAP-based ubiquitous network architecture.
  10. 10. SYSTEM FUNCTIONS OF CAP DEVICES Fig. 3. The function block diagram of CAP devices.
  11. 11. SYSTEM FUNCTIONS OF CAP DEVICES <ul><li>1) Packet forwarder: It is responsible for forwarding the packet and is able to control the data transmission flow. </li></ul><ul><li>2) Policy routing engine: Routing rules in this engine decide whether any packet, that enters the CAP device and is authenticated by the extensible authentication protocol (EAP) module and the AAA-client module, can be forwarded or not. </li></ul>
  12. 12. SYSTEM FUNCTIONS OF CAP DEVICES <ul><li>3) AP management module: it is the management core for the whole CAP control and operation. </li></ul><ul><li>4) AAA-client module: In response to the AAA server on the CATV head-end, it provides authentication and authorization services for users and avoid illegal packets to occupy data paths between CMTS and CAP. </li></ul>
  13. 13. SYSTEM FUNCTIONS OF CAP DEVICES <ul><li>5 ) Packet inspector : It offers a management tool for monitoring and controlling data flow of all packets that enters the CAP. </li></ul><ul><li>6) Basic Internet services: It provides the HTTP proxy service and issues dynamic IP addresses for users. </li></ul><ul><li>7) Light weight Web server: The CAP must have built-in capability as a Web server with an intrinsic homepage to enable first time users to register. </li></ul>
  14. 14. SYSTEM FUNCTIONS OF CAP DEVICES <ul><li>8) Watchdog and monitoring module: It is used to monitor the condition of connection from the user and to determine whether the user is still on-line based on the access continuity or termination so as to charge the user accordingly. </li></ul><ul><li>9) SNMP agent: The CAP provides network management capability. Through simple network management protocol (SNMP) command, the CAP can access its management information base (MIB) parameters to figure out whether the device works normally. </li></ul>
  15. 15. SYSTEM FUNCTIONS OF CAP DEVICES <ul><li>10) PPTP/IPSEC engine: The CAP supports point-to-point tunneling protocol (PPTP) to allow every node in the WLAN to connect with each other through Internet. Following Internet protocol security (IPSEC) communication protocol, the operation system could provide packet encryption service for safe communication requirement among the application softwares to further ensure the confidentiality, integrity, and reliability of all data. </li></ul>
  16. 16. AAA-CLIENT MECHANISM <ul><li>The AAA service consists of a subscriber database and a server that has authentication and authorization functions. </li></ul><ul><li>It is responsible for the processing of user identification (ID) verification and access permission according to the database. </li></ul>
  17. 17. AAA-CLIENT MECHANISM Fig. 4. Proposed flowchart of AAA-client mechanism in the CAP device.
  18. 18. AAA-CLIENT MECHANISM <ul><li>After receiving an 802.11 packet, the CAP device extracts the MAC address from the packet and compares it with the EAP-verified MAC table. </li></ul><ul><li>If there is a match, then the packet complies with 802.1x EAP protocol and comes from a legal user. The packet isthen processed in the decryption module based on a mechanism such as the wired equivalent privacy (WEP). </li></ul>
  19. 19. AAA-CLIENT MECHANISM <ul><li>It then proceeds to the label tagged virtual LAN (VLAN) to carry on Layer-3 network authentication process. </li></ul><ul><li>If the MAC address of the packet is from an illegal user, there are two different processes to be performed depending on the frame type filter. </li></ul>
  20. 20. PERFORMANCE ANALYSIS OF CAP DEVICES <ul><li>Three experiments are conducted to test the performance of the proposed CAP device. </li></ul><ul><li>The temperature and connection quality test. </li></ul><ul><li>The impact of different heights on transmission effectiveness. </li></ul><ul><li>The signal quality test at different distance ranges. </li></ul>
  21. 21. The temperature and connection quality test
  22. 22. The impact of different heights on transmission effectiveness Fig. 5. CAP devices placed at different height.
  23. 23. The impact of different heights on transmission effectiveness
  24. 24. The signal quality test at different distance ranges
  25. 25. CONCLUSION <ul><li>This paper proposed a cost-effective, data access efficient, robust, and easy to deployment outdoor CAP devices with AAA-client mechanism that merges CM module with WLAN AP into existing outdoor CATV amplifiers to assist in constructing a ubiquitous network for public wireless access link services and applications. </li></ul>
  26. 26. REFERENCES <ul><li>Ren-Guey Lee, Chien-Chih Lai, and Chun-Chieh Hsiao, “ Implementation of a Cable Access Point Device for Ubiquitous Network Applications” IEEE Transactions on Consumer Electronics, Vol. 52, No. 2, MAY 2006. </li></ul>
  27. 27. REFERENCES <ul><li>[1] J. Weatherall and A. Jones, “Ubiquitous networks and their applications,” IEEE Wireless Commun. , vol. 9, no. 1, pp. 18–29, Feb. 2002. </li></ul><ul><li>[2] S. Yoshino, M. Nakayama, and M. Shimizu, “A new wireless access system for achieving a cost-effective ubiquitous network,” in Proc. 5 th Int. Symp. Wireless Pers. Multimedia Commun. , Oct. 2002, pp. 606–610. </li></ul>